But sellfy started at under 5% fees and selly was originally free. These are the pricing models they moved to with the hopes of growing beyond the percent commissions which honestly isn't that great for the general “indie” market.
They do both have multiple clones that have popped up and which you could eventually probably find for free.
Sellfy sort of went with artists if I remember correctly. Another one focused on films. Another on ebooks. Others stay general to digital products but be aware you're also going to have to combat fraud.
Rocketr continues to process orders but development did for the most part stall after not being able to move toward payment processing more generally (costly).
The payout times and fees you advertise for competitors charging are overly inflated by like double at least.
Once you move away from Shopify or woocommerce there are plenty of companies offering these services with similar enough interfaces. Sellfy, selly, rocketr to name a few that have been around ~3+ years.
Most of these have clones that offer free services in all major payment options and cryptocurrencies.
I think you will need to differentiate your company more to have any traction. Creator sponsoring of some nature seems like the best suggestion I read here. Good luck
I do mean fraud by sellers not buyers though.
The others were more active but quite possibly. Good luck on th journey m8 hmu if you like.